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參數(shù)資料
| 型號： | PCM1760 |
| 英文描述： | Multi-Bit Enhanced Noise Shaping 20-Bit ANALOG-TO-DIGITAL CONVERSION SYSTEM |
| 中文描述： | 多位增強(qiáng)噪聲整形的20位模擬數(shù)字轉(zhuǎn)換系統(tǒng) |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 201K |
| 代理商： | PCM1760 |
PCM1760P/U DF1760P/U
10
The DF1760 accepts the four-bit 64fs noise shaped data
stream from the PCM1760 and decimates to 1/16 with an
initial filter, and then decimates to 1fs 20-bit data using a 4
x
oversampling filter.
The PCM1760 and DF1760 combination achieves a dy-
namic range of 108dB and SNR of 110dB even with a
single-ended input.
FIGURE 6. Multi-bit Enhanced Noise Shaping.
+
2nd Order
Integrator
∫∫
4Bits
Output
ADC
DAC
4Bits
+
2nd Order
Integrator
∫∫
Input
FIGURE 7. Recommended Power Supply Connection and
Decoupling.
LAYOUT PRECAUTIONS
Analog common and digital common of the PCM1760 are
not connected internally. These should be connected to-
gether with the common of the DF1760 as close to the unit
as possible, preferably to a large ground plane under the
PCM1760.
The use of a separate +5V supply is recommended for the
PCM1760 and DF1760, and to connect the common at one
point as described above. Low impedance analog and digital
commons returns are essential for better performance.
The power supplies should be bypassed with tantalum ca-
pacitors as close as possible to the units. See Figure 7 for
recommended common connections and power supplies
bypassing.
THEORY OF OPERATION
MULTI-BIT ENHANCED NOISE SHAPING
A block diagram of a typical 1-bit delta-sigma modulator is
shown in Figure 4.
In Figure 4, the quantizer consists of a single bit which has
two possible states, either “0” or “1”. The input signal is
sampled at a much higher sample rate than the nyquist
sampling frequency. The quantizer output data stream is
digitally filtered for higher resolution nyquist data. The
theoretical SNR is determined by the number of the order of
the integrator and the oversampling rate.
There is a practical limit to increasing the numbers of order
of the integrator due to an inherent oscillation in the modu-
lator. There is also a limit to increasing the sample rate due
to the increase in jitter sensitivity associated with high clock
frequencies.
The PCM1760 utilizes a four-bit quantizer instead of the
conventional one-bit method. The quantizing noise of a four-
bit quantizer is 1/16 of the one-bit version. Using the four-
bit quantizer allows for a lesser order number of the integra-
tor and a lower oversampling rate to achieve similar perfor-
mance to that of a more complex one-bit system.
A block diagram of the PCM1760 modulator is shown in
Figure 6. The PCM1760 is a fourth-order integrator that
samples at 64
x
oversampling, and samples left and right
channel input signal simultaneously.
+
Integrator
∫
Quantizer
Output
Input
z
–1
FIGURE 4. Single Stage 1-Bit Delta-Sigma.
FIGURE 5. Single Stage Multi-bit Delta-Sigma.
+
Integrator
∫
nBit
Output
Input
ADC
DAC
nBit
(1)
PCM1760
22
21
20
6
7
8
Power Supply
GND
–5V
+5V
(1)
Power Supply
GND
+5V
(1)
(1)
(1)
DF1760
28
27
8
9
(2)
Digital
Common
NOTE: (1) Tantalum 3.3μF. (2) Ceramic 0.1μF.
Analog
Common
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCM1760P | Multi-Bit Enhanced Noise Shaping 20-Bit ANALOG-TO-DIGITAL CONVERSION SYSTEM |
| PCM1808 | SINGLE-ENDED, ANALOG-INPUT 24-BIT, 96-kHz STEREO A/D CONVERTER |
| PCM1808PW | SINGLE-ENDED, ANALOG-INPUT 24-BIT, 96-kHz STEREO A/D CONVERTER |
| PCM1808PWG4 | SINGLE-ENDED, ANALOG-INPUT 24-BIT, 96-kHz STEREO A/D CONVERTER |
| PCM1808PWR | SINGLE-ENDED, ANALOG-INPUT 24-BIT, 96-kHz STEREO A/D CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1760P | 功能描述:IC DUAL 20-BIT A/D CONV 28-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| PCM1760P-L | 功能描述:IC DUAL 20-BIT A/D CONV 28-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| PCM1760U | 制造商:Rochester Electronics LLC 功能描述:20BIT A/D CONVERTER - Bulk |
| PCM1760U/1K | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Multi-Bit Enhanced Noise Shaping 20-Bit |
| PCM1760U-L | 功能描述:IC DUAL 20-BIT A/D CONV 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
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